1.LED Blink:
This classic Arduino project blinks an LED connected to a digital pin of the Arduino board. Here’s the code:
const int ledPin = 13; // LED connected to digital pin 13
void setup() {
pinMode(ledPin, OUTPUT); // Set the LED pin as an output
}
void loop() {
digitalWrite(ledPin, HIGH); // Turn the LED on
delay(1000); // Wait for 1 second
digitalWrite(ledPin, LOW); // Turn the LED off
delay(1000); // Wait for 1 second
}
2.Ultrasonic Distance Measurement:
This project uses an ultrasonic sensor to measure the distance to an object and displays it on the serial monitor. Here’s the code:
const int trigPin = 2; // Trigger pin of the ultrasonic sensor
const int echoPin = 3; // Echo pin of the ultrasonic sensor
void setup() {
Serial.begin(9600); // Initialize serial communication
pinMode(trigPin, OUTPUT); // Set the trigger pin as an output
pinMode(echoPin, INPUT); // Set the echo pin as an input
}
void loop() {
long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH); // Send a 10us pulse
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH); // Measure the pulse duration from the echo pin
distance = duration * 0.034 / 2; // Calculate the distance in centimeters
Serial.print(“Distance: “);
Serial.print(distance);
Serial.println(” cm”);
delay(500); // Wait for 0.5 seconds before taking the next measurement
}
3.Servo Motor Control:
This project controls a servo motor’s position using a potentiometer. The servo motor moves based on the potentiometer’s position. Here’s the code:
#include <Servo.h>
const int potPin = A0; // Potentiometer connected to analog pin 0
const int servoPin = 9; // Servo motor control pin
Servo servo;
void setup() {
servo.attach(servoPin); // Attach the servo to the specified pin
}
void loop() {
int angle = map(analogRead(potPin), 0, 1023, 0, 180); // Map the potentiometer value to servo angle range (0-180)
servo.write(angle); // Set the servo position based on the potentiometer value
delay(15); // Add a small delay for smooth servo movement
}
4.Temperature and Humidity Monitoring with DHT11 Sensor:
This project uses a DHT11 sensor to measure temperature and humidity and displays the readings on the serial monitor. Here’s the code:
#include <DHT.h>
#define DHTPIN 2 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT sensor type
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600); // Initialize serial communication
dht.begin(); // Initialize DHT sensor
}
void loop() {
float temperature = dht.readTemperature(); // Read temperature in Celsius
float humidity = dht.readHumidity(); // Read relative humidity
Serial.print(“Temperature: “);
Serial.print(temperature);
Serial.print(” °C”);
Serial.print(” Humidity: “);
Serial.print(humidity);
Serial.println(” %”);
delay(2000); // Wait for 2 seconds before taking the next reading
}
5.PIR Motion Sensor Alarm:
This project uses a PIR (Passive Infrared) motion sensor to detect movement and triggers an alarm using a buzzer or LED. Here’s the code:
int pirPin = 2; // PIR sensor output pin
int ledPin = 13; // LED pin for alarm indication
void setup() {
pinMode(pirPin, INPUT); // Set PIR pin as an input
pinMode(ledPin, OUTPUT); // Set LED pin as an output
Serial.begin(9600); // Initialize serial communication
}
void loop() {
int pirStatus = digitalRead(pirPin); // Read the PIR sensor status
if (pirStatus == HIGH) {
digitalWrite(ledPin, HIGH); // Turn on the LED
Serial.println(“Motion detected!”);
delay(1000); // Delay for 1 second
} else {
digitalWrite(ledPin, LOW); // Turn off the LED
}
}
6.LCD Display with Button Control:
This project displays a message on an LCD screen and allows users to control the display using buttons. Here’s the code:
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // Initialize the LCD object
int buttonPin = A0; // Button pin
int buttonState = 0; // Current button state
int count = 0; // Counter variable
void setup() {
lcd.begin(16, 2); // Set the LCD dimensions
pinMode(buttonPin, INPUT); // Set button pin as an input
lcd.print(“Press Button”); // Display initial message
}
void loop() {
buttonState = digitalRead(buttonPin); // Read button state
if (buttonState == HIGH) {
count++; // Increment the counter
lcd.clear(); // Clear the LCD display
lcd.setCursor(0, 0); // Set the cursor to the first row
lcd.print(“Button Pressed”); // Display message
lcd.setCursor(0, 1); // Set the cursor to the second row
lcd.print(“Count: ” + String(count)); // Display the counter value
delay(1000); // Delay for 1 second
}
}
